Retrospective Study Open Access
Copyright ©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Psychiatry. Nov 19, 2023; 13(11): 872-883
Published online Nov 19, 2023. doi: 10.5498/wjp.v13.i11.872
Analysis of the relationship between blood pressure variability and subtle cognitive decline in older adults
Hui-Feng Guo, Jie Li, Feng-Feng Pan, Department of Gerontology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
Yi Wu, Prenatal Diagnosis Center, International Peace Maternity & Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200030, China
ORCID number: Hui-Feng Guo (0000-0001-9333-7259); Yi Wu (0000-0001-9401-8807); Jie Li (0009-0000-5999-9654); Feng-Feng Pan (0000-0003-1609-2504).
Co-corresponding authors: Hui-Feng Guo and Yi Wu.
Author contributions: HF Guo and Y Wu analyzed the data and wrote the paper; Li J was responsible for execution and data collection; Pan FF was responsible for the study conception and design; the final version of the manuscript has been approved by all authors. Guo HF and Wu Y contributed equally to this work as co-corresponding authors. The reasons for designating them as co-corresponding authors are as follows: Firstly, this manuscript is a collaborative work. The designation of co-corresponding authorship accurately reflects the distribution of responsibilities and burdens associated with the time and effort required to complete the study and the resultant paper. Secondly, Guo HF and Wu Y contributed equally to this work. The choice of these researchers as co-corresponding authors acknowledges and respects this equal contribution, while recognizing the spirit of teamwork and collaboration of this study. Guo HF is responsible for the overall planning and the organization of clinical data, Wu Y is responsible for the data summary and statistical analysis. In summary, we believe that designating Guo HF and Wu Y as co-corresponding authors of is fitting for our manuscript as it accurately reflects our team's collaborative spirit, equal contributions, and diversity.
Supported by Shanghai Municipal Commission of Science and Technology Program, No. 19411960900.
Institutional review board statement: The study was reviewed and approved by the Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, approval No. 2022-0326.
Informed consent statement: All study participants provided written informed consent for personal and medical data collection prior to study enrollment.
Conflict-of-interest statement: The authors declare no conflict of interest.
Data sharing statement: The dataset is available from the corresponding author at ghfghm@163.com.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Hui-Feng Guo, MM, Associate Chief Physician, Department of Gerontology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No. 600 Yishan Road, Xuhui District, Shanghai 200233, China. ghfghm@163.com
Received: August 30, 2023
Peer-review started: August 30, 2023
First decision: September 13, 2023
Revised: September 18, 2023
Accepted: October 23, 2023
Article in press: October 23, 2023
Published online: November 19, 2023

Abstract
BACKGROUND

Blood pressure variability (BPV) has been shown to be related to mild cognitive impairment and Alzheimer's disease in a number of studies. However, the relationship between BPV and subtle cognitive decline (SCD) has received minimal attention in this field of research to date and has rarely been reported.

AIM

To examine whether SCD is independently associated with changes in BPV in older adults.

METHODS

Participants were selected based on having participated in cognitive function evaluation and ambulatory blood pressure measurement at the Shanghai Sixth People's Hospital Affiliated with Shanghai Jiao Tong University School of Medicine between June 2020 and August 2022. The participants included 182 individuals with SCD as the experimental group and 237 with normal cognitive function as the control group. The basic data, laboratory examinations, scale tests, and ambulatory blood pressure test results of the two groups were analyzed retrospectively, and the relationship between SCD and BPV was subsequently evaluated.

RESULTS

Significant differences were observed between the two groups of participants (P < 0.05) in terms of age, education level, prevalence rate of diabetes, fasting blood glucose level, 24-h systolic blood pressure standard deviation and coefficient of variation, 24-h diastolic blood pressure standard deviation and coefficient of variation. The scale monitoring results showed significant differences in the scores for memory, attention, and visual space between the experimental and control groups. Logistic regression analysis indicated that age, education level, blood sugar level, and BPV were factors influencing cognitive decline. Linear regression analysis showed that there was an independent correlation between blood pressure variation and SCD, even after adjusting for related factors. Each of the above differences was still significant.

CONCLUSION

This study suggests that increased BPV is associated with SCD.

Key Words: Blood pressure, Variability, Elderly, Subtle cognitive decline relationship

Core Tip: Cognitive dysfunction is a disease that seriously endangers human health, and its current treatment measures are far from perfect. Early identification, which can facilitate the implementation of early treatment, is the primary focus of this research. Our aim was to explore the correlation between blood pressure variability (BPV) and subtle cognitive decline and to understand whether BPV can be used for early detection of cognitive impairment.



INTRODUCTION

Alzheimer's disease (AD) is a highly harmful disease. Epidemiological surveys have shown that there are more than 30 million AD patients globally, and it is expected that in 30 years, this number will have expanded to 130 million. Cognitive impairment resulting from AD is serious and irreversible, carries a high disability rate, and is difficult to cure, placing a huge burden on both families and society as a whole[1,2]. Although much work has already been performed in this area, there remains no truly effective therapy for AD. Early identification, screening, detection, and intervention are important for preventing the progression of the disease[3-6]. The National Institute on Aging and the Alzheimer’s Association have classified AD into three distinct stages[7]: The AD preclinical stage [subjective cognitive decline and subtle cognitive decline (SCD), AD-derived mild cognitive impairment (MCI), and the dementia stage]. SCD refers to the initial phase of cognitive decline. Memory loss is the primary symptom of AD during this period, although a routine examination cannot indicate MCI caused by dementia. According to prior research, early identification and prompt intervention can help prevent 30% of the risk factors associated with AD[4,8,9]. Therefore, SCD has become a popular topic in early-stage AD research. Unlike gene testing, cerebrospinal fluid, and positron emission tomography (PET), blood pressure variability (BPV) testing is inexpensive, non-invasive, and easy for patients to accept. Determining the correlation between BPV and cognitive impairment can provide valuable insight for clinicians regarding the process of diagnosis and treatment.

BPV, also known as blood pressure volatility, indicates the degree to which an individual's blood pressure fluctuates during a certain period of time and does not depend on blood pressure levels[10-12]. BPV is an indicator of spontaneous fluctuations in blood pressure, which are closely related to arterial remodeling, left ventricular hypertrophy, stroke, and hypertensive renal damage. In the physiological process that emerges during the progression from hypertension to cardio-cerebrovascular events, BPV plays an adverse role at every stage[13-16]. Blood pressure changes that occur within 24 h (short-term BPV) are more valuable for predicting the risk of cardiovascular death than clinical blood pressure. Previously published articles have found that the predictive effect of clinical blood pressure is limited, and short-term BPV can serve as a more accurate indicator than clinical blood pressure; therefore, the use of ambulatory blood pressure monitoring (ABPM) should be widely promoted over the use of clinical blood pressure[17-19]. Previous studies have shown that that BPV is associated with MCI and AD[20-22], but studies on BPV and SCD to date have proven rare. SCD is an early stage of AD, and those with SCD face a significantly higher risk of developing MCI and AD people with SCD than those with normal cognitive function[23-25]. Our aim was to evaluate the correlation between BPV and SCD and to analyze whether BPV could be used as a screening index for early cognitive decline.

MATERIALS AND METHODS
Participants

From June 2020 to August 2022, 1095 people who participated in a routine physical examination at the Department of Geriatrics of Shanghai Sixth People’s Hospital completed the neuropsychological scale test and 24-h ABPM. According to the test results, 237 individuals had normal cognitive function and were classified as the control group (NC), and 182 had SCD and were classified as the experimental group (SCD). The basic data, laboratory examinations, scale tests, and ABPM test results of the SCD and NC groups were retrospectively analyzed, and the relationship between BPV and SCD was subsequently assessed.

Inclusion criteria: (1) Participants aged 60 or older; (2) those who have a primary school level education or higher; and (3) those who possess a normal level of hearing and eyesight.

Exclusion criteria: (1) Patients with MCI and AD; (2) those with a history of cerebrovascular disease, such as brain trauma, cerebral infarction, cerebral hemorrhage, Parkinson's disease, brain tumor, epileptic psychosis, or dysplasia; (3) those with a Hamilton Depression Rating Scale 17-item score of more than 12; (4) those with other diseases affecting cognitive function, such as B12 deficiency, alcoholism, folic acid, drug abuse, syphilis, and AIDS; (5) those with visual impairment, hearing impairment, and limb dysfunction resulting in an inability to complete the neuropsychological scale; and (6) those with serious diseases in major organs, such as the liver, kidneys, heart, and lungs.

Clinical-demographic data

Participants’ sex, age, height, weight, educational attainment, and history of chronic diseases were recorded. On the same day, routine blood tests, blood lipids, liver and kidney function, and blood glucose were checked, and a head magnetic resonance imaging examination was conducted.

Cognitive function

In a specialized neuropsychological room, the scale was assessed by trained professionals. Scale detection participants did not participate in the judgment of cognitive diagnosis. Each participant was screened using strict scale tests to assess memory, space, attention, language, execution, and social cognition; the scales utilized included a mini-mental state examination (MMSE), the Chinese version of the Montreal Cognitive Assessment (MoCA; MoCA-CV), Hamilton Depression Scale, Auditory Verbal Learning Test (AVLT), Animal Verbal Fluency Test (AFT), Boston Naming Test (BNT), Symbol Digit Modalities Test (SDMT), Rey-Osterrieth Complex Figure Test (CFT), Trail Making Test Part A (TMT-A) and part B (TMT-B), Prospective Memory Test (PrM), Functional Activities Questionnaire (FAQ), and so on.

ABPM and BPV indices

Twenty-four-hour ABPM: The testing period was from 7:00 on day one to 7:00 the following day, from 7:00 to 21:59 during the day, and was recorded every 30 minutes. At nighttime, the testing period was from 22:00 to 6:59 on the second day, with tests taken every 60 min. To be included in the group, the valid readings had to be greater than 90%. BPV indices included 24-h systolic blood pressure standard deviation (SBP SD) and coefficient of variation (SBP CV) as well as 24-h diastolic blood pressure standard deviation (DBP SD) and coefficient of variation (DBP CV). The coefficient of variation was calculated using the formula CV = 100 × SD/mean.

Biochemical indicators

On the day of the scale test, after fasting for 8 h, venous blood samples were taken and immediately tested for blood glucose (fasting and two hours postprandial blood glucose), blood lipids, serum creatinine, serum uric acid, and so on.

Diagnostic criteria of SCD

A total of six neuropsychological scores were examined using the method by Jak and Bondi: the AFT and a 30-item BNT were administered to evaluate language; the TMT-A and TMT-B were administered to evaluate attention/executive function; and two scales were applied to evaluate memory function - the Rey AVLT, a 30-min delayed free recall test, and AVLT recognition. The criteria were used to determine whether participants had SCD: (1) Cognitive decline on two of the six neuropsychological measures in different cognitive fields, defined as > 1 SD below the age-corrected normative mean; and (2) a FAQ score of 6-8[23].

Statistical analysis

The statistical analysis was conducted using SPSS 24.0. We used the mean ± SD to represent the measurement data, and a t-test was applied to compare the NC and SCD groups. A χ2 test was utilized to compare the counting data between the two groups. A binary logistic regression was used to analyze the related factors of cognitive impairment, and a multiple linear regression was performed to determine cognitive domain scores were correlated with BPV. The level of sig-nificance was set at P ≤ 0.05.

RESULTS
Demographic characteristics of the subjects

Table 1 presents the general characteristics of the participating researchers. Significant differences were observed in age, education level, incidence of diabetes, fasting blood glucose levels, SBP SD, SBP CV, DBP SD, and DBP CV between the NC ang SCD groups. No significant differences in other indices were observed.

Table 1 General characteristics of participants.

NC (n = 237)
SCD (n = 182)
P value
Age, yr70.35 ± 9.5772.19 ± 10.310.002
Sex (male, %)169 (71.31%)127 (69.78%)0.219
Education, yr11.49 ± 4.1210.05 ± 3.790.037
BMI (kg/m2)22.47 ± 4.9123.16 ± 5.030.291
Smoking, n (%)51 (21.52)39 (21.43)0.479
Drinking, n (%)72 (30.38)57 (31.32)0.517
Hypertension, n (%)104 (43.88)83 (45.60)0.153
Diabetes, n (%)35 (14.77)31 (17.03)0.021
CAD, n (%)29 (12.24)27 (14.84)0.149
FBG (mmol/L)5.41 ± 1.175.93 ± 1.610.037
PBG (mmol/L)8.75 ± 2.818.59 ± 2.630.275
Scr (µmol/L)82.45 ± 29.5179.43 ± 28.720.117
TC (mmol/L)4.53 ± 1.374.19 ± 0.950.093
TG (mmol/L)1.32 ± 0.751.42 ± 0.810.055
HDL-C (mmol/L)1.15 ± 0.511.17 ± 0.490.213
LDL-C (mmol/L)2.39 ± 0.832.21 ± 0.790.314
SBP SD10.52 ± 2.9414.15 ± 4.370.000
DBP SD7.32 ± 2.749.45 ± 3.070.040
SBP CV12.35 ± 3.7416.97 ± 4.910.000
DBP CV9.85 ± 2.7312.63 ± 3.810.006
Cognitive scale score

As shown in Table 2, a significant difference was observed between the two groups on the MMSE and the MoCA. A comparison of the scores for each cognitive domain revealed significant differences in attention, memory, and visual space between the two groups.

Table 2 Scores of personnel cognition scale in two groups.
Index
NC (n = 207)
SCD (n = 175)
F (P value)
MMSE28.97 ± 2.1326.15 ± 1.6249.327 (< 0.001)
MoCA25.74 ± 2.9622.93 ± 3.2757.319 (< 0.001)
AVLT recognition21.39 ± 5.2719.31 ± 3.773.572 (0.041)
AVLT delayed recall6.32 ± 2.294.17 ± 1.598.351 (0.011)
BNT24.15 ± 3.1422.59 ± 3.570.275 (0.179)
SDMT39.29 ± 12.5734.26 ± 11.094.529 (0.032)
TMT-A53.14 ± 23.9557. 83 ± 26.710.127 (0.359)
TMT-B133.49 ± 39.72154.97 ± 45.215.273 (0.019)
Rey CFT copy34.59 ± 3.7131.49 ± 4.258.319 (0.014)
Rey CFT recall16.72 ± 5.9313.27 ± 6.419.592 (< 0.001)
AFT16.79 ± 4.5216.32 ± 4.170.035 (2.531)
PrM14.31 ± 4.1512.29 ± 4.523.572 (0.031)
Analysis of influencing factors of cognitive impairment

Using cognitive decline as a dependent variable and other influencing factors as independent variables, multivariate logistic regression analysis revealed that cognitive decline was significantly correlated with age, education level, diabetes, SBP SD, DBP SD, SBP CV, and DBP CV (Table 3).

Table 3 Logistic regression analysis influencing factors of cognitive impairment.
Index
β
SE
Wald
P value
OR
95%CI
Age0.370.0917.590.0001.631.45-1.81
Education0.750.1320.310.0001.921.75-2.31
Diabetes0.110.0313.270.0001.211.09-1.37
SBP SD1.310.2426.150.0003.952.57-4.72
SBP CV0.950.2130.630.0003.712.69-4.63
DBP SD2.470.618.590.0239.723.51-18.95
DBP CV0.850.1927.330.0023.012.65-3.91
Effect of blood pressure variation on cognitive performance

Multiple linear regression analysis demonstrated that memory, attention, and visual-spatial dysfunction in the SCD group were significantly correlated with SBP SD and CV, while DBP SD and CV were significantly correlated with memory impairment. Even adjusting for age, sex, drinking, smoking, education level, body mass index, blood glucose, and blood lipid levels, these differences remained significant (Table 4).

Table 4 Correlation between blood pressure variability and cognitive function by multivariate linear regression analysis.
OutcomeUnadjusted model
P valueAdjusted model 1
P valueAdjusted model 2
P value
β (95%CI)
β (95%CI)
β (95%CI)
MemorySBP SD -0.82 (-1.17 to -0.49)< 0.001-0.57 (-0.91 to -0.22)< 0.001-0.51 (-0.89 to -0.21)< 0.001
SBP CV-0.79 (-1.15 to -0.42)< 0.001-0.61 (-0.93 to -0.32)< 0.001-0.59 (-0.91 to -0.25)< 0.001
DPB SD-0.31 (-0.56 to -0.07)< 0.05-0.29 (-0.51 to -0.08)0.029-0.27 (-0.49 to -0.07)0.035
DPB CV-0.27 (-0.55 to 0.01)0.037-0.26 (-0.47 to -0.08)0.041-0.23 (-0.41 to -0.03)0.049
LanguageSBP SD 0.04 (-0.02 to 0.09)0.1550.03 (-0.01 to 0.07)0.1650.03 (-0.02 to 0.09)0.172
SBP CV0.04 (-0.01 to 0.11)0.1530.03 (-0.01 to 0.09)0.1670.03 (-0.02 to -0.10)0.157
DPB SD0.11 (-0.01 to 0.23)0.2410.09 (0.02 to 0.19)0.3050.09 (0.01 to 0.18)0.291
DPB CV0.08 (-0.02 to 0.17)0.1950.07 (-0.01 to 0.15)0.2360.07 (-0.02 to 0.16)0.229
AttentionSBP SD -0.76 (-1.07 to -0.39)< 0.001-0.67 (-1.03 to -0.21)< 0.001-0.70 (-1.01 to -0.39)< 0.001
SBP CV-0.69 (-0.95 to -0.27)< 0.001-0.61 (-0.93 to -0.25)< 0.001-0.59 (-0.87 to -0.31)< 0.001
DPB SD-0.17 (-0.35 to 0.02)0.09-0.11 (-0.32 to 0.01)0.13-0.12 (-0.31 to 0.02)0.13
DPB CV-0.15 (-0.29 to -0.01)0.08-0.09 (-0.03 to 0.02)0.15-0.08 (-0.02 to 0.03)0.17
Visuospatial abilitySBP SD -0.27 (-0.39 to -0.14)< 0.01-0.21 (-0.35 to -0.10)< 0.01-0.20 (-0.33 to 0.06)< 0.01
SBP CV-0.31 (-0.42 to -0.21)< 0.01-0.27 (-0.39 to -0.14)< 0.01-0.22 (-0.40 to -0.05)< 0.01
DPB SD-0.11 (-0.25 to -0.03)0.147-0.07 (-0.02 to 0.03)0.163-0.06 (-0.02 to 0.01)0.179
DPB CV-0.15 (-0.29 to 0.01)0.133-0.08 (-0.19 to 0.02)0.182-0.08 (-0.18 to 0.03)0.195
Executive functionSBP SD 0.16 (0.05 to 0.28)0.2170.12 (-0.02 to 0.23)0.3270.11 (-0.01 to 0.27)0.401
SBP CV0.15 (0.05 to 0.26)0.1950.11 (-0.01 to 0.21)0.3130.10 (0.01 to 0.0.21)0.374
DPB SD0.23 (0.09 to 0.39)0.2910.19 (0.03 to 0.34)0.3070.17 (0.02 to 0.33)0.351
DPB CV0.19 (0.03 to 0.37)0.2770.15 (0.04 to 0.27)0.2950.15 (0.04 to 0.29)0.283
Social cognitionSBP SD-0.06 (-0.10 to 0.02)0.571-0.04 (-0.12 to 0.07)0.653-0.03 (-0.11 to 0.06)0.692
SBP CV-0.05 (-0.09 to 0.04)0.612-0.02 (-0.13 to 0.11)0.7130.01 (-0.14 to 0.13)0.865
DPB SD0.17 (0.08 to 0.27)0.1870.14 (-0.03 to 0.31)0.2950.13 (-0.02 to 0.29)0.312
DPB CV0.16 (0.04 to 0.29)0.2030.13 (-0.01 to 0.30)0.3230.12 (-0.02 to 0.27)0.371
DISCUSSION

This study aimed to identify a simple method for detecting cognitive decline in its early stages. In this retrospective study, BPV was observed to be independently associated with SCD and increased BPV in individuals aged 60 or above and may be seen as a risk factor for SCD.

Current reports on the correlation between BPV and cognitive impairment are inconsistent. Most researchers believe that cognitive impairment is associated with increased BPV. However, different views have been expressed on this topic, such as that higher BPV has nothing to do with dementia[26-28]; that patients with increased BPV have higher cognitive scores; and that only the increase in systolic blood pressure variation is related to cognitive decline, while the increase in diastolic blood pressure variation is not. In addition, there are significant differences in the cognitive assessment tools, BPV calculation method, duration of blood pressure monitoring, study population, and sample size among different studies[29-31]. Thus, standardized methods should be considered to compare and determine the significance of various studies. The results of the 24-h ABPM were used to calculate BPV, which is a more objective form of measurement than clinic blood pressure; the equipment is simple, primary medical institutions can use it, and research participants can easily accept this method.

At present, effective treatment for dementia remains far from perfect, and many people with cognitive impairment seek treatment in community medical institutions. Identifying changeable risk factors is important for preventing dementia in primary healthcare institutions. ABPM to evaluate blood pressure levels and BPV is a simple method for assessing the risk of dementia and evaluating the effectiveness of treatment.

There are several viewpoints on the mechanism underlying cognitive impairment caused by BPV[32-36]: (1) Hemodynamic instability has harmful effects on neurovascular units and results in endothelial injury and vascular smooth muscle dysfunction, leading to accelerated neuronal damage and neuronal loss; (2) arterial remodeling is beneficial to β-amyloid deposition and reactive glial hyperplasia; (3) the fluctuation of arterial blood pressure leads to inconsistent perfusion attacks of tissue hypoxia-ischemia, promoting the activation of microglia and the production of brain amyloid proteins, resulting in neuronal injury and cell death; and (4) oxidative stress and inflammation. There may be direct connections between vascular and metabolic factors and the deposition of β-amyloid proteins in the brain, promoting oxidative stress and inflammation as well as neurodegeneration.

The results of this study show that BPV can be used as a tool to screen for early-stage cognitive decline; therefore, it is possible to delay or prevent further cognitive decline by improving BPV. The sample size of future studies should be increased and long-term follow-up assessments should be conducted to identify the correlation between BPV and cognitive impairment, especially in primary medical institutions as BPV can be considered a valuable tool for screening for cognitive decline.

This study had several limitations, including that it was a small cohort study and that participants were not randomly selected, which could potentially have biased the results. Other indicators that could have an impact on the results were not used in this study to measure BPV. Cerebrospinal fluid and PET tests were not performed, and variations in blood pressure and intracranial lesions could not be identified. Follow-up work should be carried out to extend the results of the study and determine whether effective control of BPV can reduce or reverse the decline in cognitive function. Effective control of BPV was not considered in this study.

CONCLUSION

According to this study, an increase in BPV is one of the risk factors for early cognitive decline. BPV was found to be independently associated with SCD. BPV should be controlled effectively in clinical practice, especially in the treatment of hypertensive patients. The goal is not only to reach a standard blood pressure level but also to steadily reduce blood pressure and control BPV to better protect cognitive function and try to prevent or delay the occurrence of AD.

ARTICLE HIGHLIGHTS
Research background

Cognitive impairment is a highly harmful disease for which there is no perfect treatment. Early detection and treatment are the main focus of related research. Variation in blood pressure has been correlated with cognitive impairment in previous studies; however, few studies have examined subtle cognitive decline.

Research motivation

Our purpose was to analyze the influencing factors for subtle cognitive decline (SCD) and find a simple and effective index through which to assess cognitive decline that can be used to guide clinical work.

Research objectives

The study aimed to determine whether blood pressure variability (BPV) leads to cognitive impairment. The results showed that an increase in BPV is independently related to SCD and that BPV may be used as a tool for evaluating cognitive impairment and the effectiveness of treatment.

Research methods

We used a standard neuropsychological scale to evaluate cognitive function and retrospectively analyzed the correlation between BPV and SCD.

Research results

The results show that increased BPV may be a factor leading to cognitive decline. The results of such studies are rare; however, the sample size is not sufficiently large, and no further research has been carried out to determine whether it can be used as an index to analyze the effectiveness of treatment.

Research conclusions

This study demonstrates that BPV is a clinical indicator of early cognitive decline. In this study, 24-h ambulatory blood pressure monitoring test was used as an index from which to calculate BPV, one that is simple, effective, and can be readily used in primary healthcare institutions.

Research perspectives

Long-term follow-ups should be considered in the future to further the collective comprehension of the correlation between BPV and cognitive decline and the progress of cognitive impairment as well as to estimate the benefits of improving BPV in the treatment of cognitive impairment.

Footnotes

Provenance and peer review: Unsolicited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Psychiatry

Country/Territory of origin: China

Peer-review report’s scientific quality classification

Grade A (Excellent): 0

Grade B (Very good): 0

Grade C (Good): C, C

Grade D (Fair): 0

Grade E (Poor): 0

P-Reviewer: Behl T, Romania; Terada T, Canada S-Editor: Yan JP L-Editor: A P-Editor: Yu HG

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